39009987 has 12 divisors (see below), whose sum is σ = 57658744. Its totient is φ = 25401600.

The previous prime is 39009941. The next prime is 39009989. The reversal of 39009987 is 78990093.

It is a happy number.

It is not a de Polignac number, because 39009987 - 2⁶ = 39009923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39009989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50014 + ... + 50787.

Almost surely, 2^39009987 is an apocalyptic number.

39009987 is a deficient number, since it is larger than the sum of its proper divisors (18648757).

39009987 is a wasteful number, since it uses less digits than its factorization.

39009987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100850 (or 100847 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 39009987 is about 6245.7975471512. The cubic root of 39009987 is about 339.1500888639.

The spelling of 39009987 in words is "thirty-nine million, nine thousand, nine hundred eighty-seven".